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<div id="winchm_template_top">
	<div id="winchm_template_button"><A href="writing_engextcpp_extensions.htm" title="Previous topic"><img id="winchm_template_prev" alt="Previous topic" src="../template2/btn_prev_n.gif" border="0"></a><A href="parsing_extension_arguments.htm" title="Next topic"><img id="winchm_template_next" alt="Next topic" src="../template2/btn_next_n.gif" border="0"></a></div>
	<div id="winchm_template_navigation">Help &gt; 
<A href="introduction6.htm">Debugging Tools for Windows (WinDbg, KD, CDB, NTSD)</A> &gt; <A href="debugging_resources.htm">Debugging Resources</A> &gt; <A href="debugger_engine_and_extension_apis.htm">Debugger Engine and Extension APIs</A> &gt; <A href="engextcpp_extensions.htm">EngExtCpp Extensions</A> &gt; <A href="engextcpp_extension_design_guide.htm">EngExtCpp Extension Design Guide</A> &gt; </div>
	<div id="winchm_template_title">Building EngExtCpp Extensions</div>
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	<div id="winchm_template_content"><div id="mainSection"><p>The EngExtCpp extension libraries are built almost the same way as the DbgEng extension libraries. For more information, see <a href="#Bookmark917">Building DbgEng Extensions</a>.</p>
<p>The EngExtCpp implementation code (engextcpp.cpp) is used instead of  linking with a static library.</p>
<p>Because the EngExtCpp extension framework is built on top of the DbgEng extension framework, an EngExtCpp extension DLL should export the same functions as a DbgEng extension DLL.</p>
<p>Each extension should be exported.  When you use the <a href="#Bookmark938"><b>EXT_COMMAND</b></a> macro to define an extension function, this macro also creates a C function with the same name as the extension.  This function should be exported from the DLL.</p>
<p>The following functions are provided by engextcpp should be exported from the EngExtCpp DLL.</p>
<ul>
<li>
<p><b>DebugExtensionInitialize</b> -- so that the <a href="#Bookmark961"><b>Initialize</b></a> method can be called to initialize the library.</p>
</li>
<li>
<p><b>DebugExtensionUnitialize</b> -- so that the <a href="#Bookmark961"><b>Uninitialize</b></a> method can be called to uninitialize the library.</p>
</li>
<li>
<p><b>KnownStructOutputEx</b> -- so that the engine can call the <a href="#Bookmark963"><i>ExtKnownStructMethod</i></a> methods to format known structures for output.</p>
</li>
<li>
<p><b>DebugExtensionNotify</b> -- so that the engine can call the <a href="#Bookmark961"><b>OnSessionActive</b></a>, <b>OnSessionInactive</b>, <b>OnSessionAccessible</b>, and <b>OnSessionInaccessible</b> methods to notify the extension library of changes to the debugging session's state.</p>
</li>
<li>
<p><b>help</b> -- so that the EngExtCpp extension framework can automatically provide a <b>!help</b> extension.</p>
</li>
</ul>
<p>These functions can be exported even if the functionality they provide is not needed.  Moreover, if they are not exported, the functionality they provide will be lost.</p>
<p><b>DebugExtensionInitialize</b> must be exported in order for the debugger engine to recognize the DLL as a valid DbgEng extension DLL.</p></div></div>	
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